Berlin's Tempelhof Airport closed its operations last year, leaving a vast swath of land currently unused. An increasingly vocal group wants to replace the airport with the world's largest man-made mountain, adding snowy peaks to the now-flat city.

Architect Jakob Tigges developed the plan for the Berg, a 1,000 meter man-made mountain that would sit on the site of Tempelhof. Tigges believes that building the mountain would attract tourist skiers, and add green spaces and wildlife to the city. He doesn't outline what the ecological impact of building such a massive structure would be, but Inhabitat notes that the Berg has captured a lot of people's imaginations. Several German outlets have republished Tigges' mountainous plans.